Need to practice with Python. Not just for ev3dev/EV3 but surely this will be my main target.
So today I remembered the 80’s… Chaos and fractals and my 8088 taking hours to draw a Mandelbrot on an ambar Hercules screen.
So I found a simple python script from Lennart Poettering and adapted it to work on EV3:
#!/usr/bin/python3
# EV3 03m58s - video: https://youtu.be/w5aKqmXz_Wk
# based on a python script from Lennart Poettering
# found here http://0pointer.de/blog/projects/mandelbrot.html
from PIL import Image, ImageDraw
import math, colorsys
import ev3dev.ev3 as ev3
from time import sleep
lcd = ev3.Screen()
lcd.clear()
sleep(1)
dimensions = (178, 128)
scale = 1.0/(dimensions[0]/3)
center = (2.0,1.0)
iterate_max = 15
colors_max = 2
img = Image.new("1", dimensions,"white")
d = ImageDraw.Draw(img)
# Calculate the mandelbrot sequence for the point c with start value z
def iterate_mandelbrot(c, z = 0):
for n in range(iterate_max + 1):
z = z*z +c
if abs(z) > 2:
return n
return None
# Draw our image
for y in range(dimensions[1]):
for x in range(dimensions[0]):
c = complex(x * scale - center[0], y * scale - center[1])
n = iterate_mandelbrot(c)
if n is None:
v = 1
else:
v = n/100.0
if v > 0.5 :
d.point((x,y), fill = 0)
else:
d.point((x,y), fill = 1)
lcd.image.paste(img, (0,0))
lcd.update()
del d
img.save("result.png")
sleep(1)
My EV3 is running ev3dev-jessie-2016-12-21 release. No need to install PIL or anything else, just create the script, give execution permissions and run it.
The script takes 3m58s to run. next video shows the result (4x speed):
And also the output file:
Ah, those mighty 80’s!!